Lecture 27: Ethics in computer vision (part 2) 1
Announcements • Last class :( • Extra office hours: • Today: end of class until 2pm • Thurs: 12:00 - 1:00pm. • PS8 grades out (regrade requests due Friday ) • PS9, PS10 due tonight. No late days allowed. 2
Garbage in, garbage out A machine learning algorithm will do whatever the training data tells it to do. If the data is bad or biased, the learned algorithm will be too. 3 Source: Isola, Torralba, Freeman
Microsoft’s Tay chatbot Chatbot released on twitter. Learned from interactions with users Started mimicking offensive language, was shut down. 4 Image source: https://money.cnn.com/2016/03/30/technology/tay-tweets-microsoft/index.html
The Giraffe-Tree problem [“Measuring Machine Intelligence Through Visual Question Answering”, Zitnick et al., 2016] 5
Nearest neighbor baseline Train Test 6 Source: L. Zitnick
Nearest Neighbor A black and white cat Two zebras and a giraffe in a field. sitting in a bathroom sink. 7 Source: L. Zitnick See mscoco.org for image information
Image captioning An airplane is parked on the tarmac at an airport. A man riding a motorcycle on a beach. 8 Source: L. Zitnick
Results COCO Caption Challenge CIDEr-D Meteor ROUGE-L BLEU-4 Google [4] 0.943 0.254 0.53 0.309 MSR Captivator [9] 0.931 0.248 0.526 0.308 m-RNN [15] 0.917 0.242 0.521 0.299 MSR [8] 0.912 0.247 0.519 0.291 Nearest Neighbor [11] 0.886 0.237 0.507 0.280 m-RNN (Baidu/ UCLA) [16] 0.886 0.238 0.524 0.302 Berkeley LRCN [2] 0.869 0.242 0.517 0.277 Human [5] 0.854 0.252 0.484 0.217 Montreal/Toronto [10] 0.85 0.243 0.513 0.268 PicSOM [13] 0.833 0.231 0.505 0.281 MLBL [7] 0.74 0.219 0.499 0.26 ACVT [1] 0.709 0.213 0.483 0.246 NeuralTalk [12] 0.674 0.21 0.475 0.224 Tsinghua Bigeye [14] 0.673 0.207 0.49 0.241 MIL [6] 0.666 0.214 0.468 0.216 Brno University [3] 0.517 0.195 0.403 0.134 9 Source: L. Zitnick
Visual Question Answering Dataset Source: L. Zitnick
11 [“Colorful image colorization”, Zhang et al., ECCV 2016] Source: Isola, Torralba, Freeman
12 [“Colorful image colorization”, Zhang et al., ECCV 2016]
13 [“Colorful image colorization”, Zhang et al., ECCV 2016] Source: Isola, Torralba, Freeman
Generalization 14
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